Pipe perforator



Septo 27, 1949 1 R, JQBE l 2,482,913

' PIPE PERFORATOR Filed March 12, 1945 Y formed of sections screwed together.

Patented Sept. 27,n 1949 ,UNITEDV STATESA PATENT OFFICE PIPE rERFoRA'ron c `John R.' J obe, Houston, Tex.y

l Application March-12, 1945, serial No. 582,369

4 claims. (o1. 16s- 1) This'invention relates to a pipe perforator.

An object of the invention is to provide a tool of the character described specially designed for the Venlarged by the abrasive inuence of gritvinI the' inflowing fluid. Y

' A further object of the invention is to provide a tool of the character described Vwhich may beset at a selected place in the pipe and after the pipe has beenV perforated may be released and withdrawn from the pipe and reloaded for another operation so that as many perforations as desired may be made in the pipe.

It is a further object of the invention to provide, in a tool of the character described, a hydraulically operable perforating mechanism.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure 1 shows a vertical, sectional view of the tool in position to be set in theY well pipe.

Figure 2 shows a vertical, sectional View of the tool set in the well pipe with the perforating mechanism inactive position.

Figure 3 shows a fragmentary, side view, partly in section, showing the tool released and ready to be withdrawn from the pipe.

Figure 4 shows an enlarged, fragmentary, sectional view of the perforating mechanism.

Figure 5 shows a cross, sectional view taken on the line 5-5 of Figure 4.

Figure 6 shows a detached, elevational view of the collar finder. v

. Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the figures, the numeral I designates the body of the tool which may be Screwed onto the lower end of the body there is a guide 2 and screwed onto the upper end of the body are the jars 3 comprising interconnecting links slackly linked together. The upper end of the jars are provided with an outwardly threaded pin 4 to 2 receive a' rope socketY operating` line may be connected to the tool.

In theupper endof the body there is a cylinder iwhich extends on up through theylower jar member andthe lower end of this cylinder'is reduced forming an upwardly Yfacing shoulder 6. In this'cylinder there is a plunger 1 whose lower end is reduced forming a downwardly facing shoulder 8 said reduced lower end fitting into the reduced lower end of the cylinder.

Around said plunger and interposed between said shoulders there is a strong coil spring 9.

The cylinder has an intake channel I0 beneath` the shoulder 6 and a discharge channel I I above saidshoulder.

The lower end ofthe cylinder 5 is formed with' the valve seat I8 which is normally closed by the downwardly opening valve I9. This valve is held in closed-position byV means of acoil spring 20 which is supported on the plug I6.

Upon upward movement of the upper jar ymember thel plunger 1 will be elevated by the spring S'and liquid will be drawn into the reduced lower end of the cylinder 5 through the channel IB. Upon Ydownward movement of the upper Vj ar member the plunger 1 will be forced downwardly, the liquid in the cylinder 5 above the shoulder 6 being forced out through the'channel II and the liquid in the reduced lower end-of said cylinder being forced downwardly past the valve I9 andthrough the channel I1 into the upper rend of the cylinder I2. ciprocated additional liquid will be forced into the cylinder I2 andthe piston I4 therein will be- I I1V moves forced downwardly. As the piston downwardly the stem I5 will also move downwardly through the axial'bore 2| in the bodyl I y beneath.

formed with a socket 24. The inner end of thisA barrel 23is also provided with a vertical slot 25 thus forming the side flanges 26, 26 one on each` sidejof` said kslot, whose'upper ends'are formed with the beveled faces as 21.

'The'stem I5 has a vertically elongated side" by means of which an loaded, as shown in Figure 4, the plunger 3| and plug 32 are held in fixed position in the barrel bya set screw 34 which is screwed through the barrel and whose inner end abuts against the plunger 3| and plug 32, as shown in Figure 4, with the -en'- larged inner end, or head, o theplunger 3J. in its inward position.

As the piston I4 is forced downwardly, as hereinabove explained, the bearing faces will engage against the inner ends: of the side flangesv 26 and will force the barrel 23 outwardly` into contact with the pipe 36 to be perforated and. thereupon the tapering ,faces 3|!r will pass by said flangesv and the barrel will vnot be forced further outwardly but the tapering face of the ribv 29 continues to operate against the plunger 3| to force the same further outwardly into the position shown in Figure 2 and the plug, or insert, 32 is forced through the pipe 36; `as shown in Figures 2v and 3.. The outside iluid may thereupon ow in Ythrough the channel 33 into the pipe 36.

Means have been provided for anchoring the tool in the pipe 36 and for releasing theV same therefrom. Said anchoring and releasingv means will now be described.

The lower endV of the body has a downwardly and inwardly tapering face 31 withwhich the wedge shaped jaw 38 has a dovetailed slidable connection. The inner side of the jaw 30 is tapered to conform to the taper of the face 31 and its outer side has pipe engaging teeth. The'lower end of the body has a transverse slot39- and: opposite said slot the inside of the jaw 38rhas a recess 4D. There is a retaining arm 4| whose' tree end extends into the recess 40 and whose-.otherend is pivoted to the body. This arm lworks in the slot 39. The guide 2 has an axial socket 4-2- therein in which there is located a carrier 43. The upper end of this carrier has a slot-44 to receivethe arm 4| and said arm is-pinne'd to the carrier and they body by means oi a frrangible pin 45. The lower end of the carrier has a deep slot i6 inf which the ngerll'l is located. Thev lower end: of this finger is pivoted to the carrier and its upperen'd'is -f-ree and beveled, as shown in Figures 1 and 2;

The sections of the pipe 36 are usually' connected by outside couplings as drrsaidends being spaced apart, as shown in, Figures 1 Yand 2.

The tool may be assembled, as shown inFigure 1, and let down into the pipel to be perforated. The `pin 45 and arinlH will hold. the jaw 38 lmitslower inner position so that it will notl engagek the .pipe 36 and prematurely set the'tool, andr the finger 41 will extend through the side slot 49 of the guide 2 and its beveled endwill ride: against the inside of the pipe 36. Vhen the tool'has been lowered to the desired location it may then be elevatedV and the free end of the linger 31 will engage in the pipe coupling ilaabove and against Vthe lower end of the corresponding pipe-section,

as Shown in Figure l and-- upon further upward movement of the tool the pin `l5 will besheared and the carrier will drop down into -thesocl:et.|l2,y

as'shown in Figure 2, thus retractingthe finger H,

`4 as shown in said gure. The jaw 38 will then be free to move upwardly. Thereupon the tool may be elevated and suddenly dropped and the inertia of the jaw 38 will allow the face 31 to move downwardly relative thereto and force the jaw outwardly into the position shown in Figure 2 and said jaw will engage the pipe 3| and support the tool against further downward movement. The jars 3 may be manipulated to pump fluid against thepiston. M, as. hereinabove explained, to force said: piston and stem I5 downwardly to force the plug, or insert, 32 through the wall of the pipe 36, as hereinabove explained. The pumping operation may then be continued to force the plunger |`4` on downwardly into the position shown in Figure 3 The inner end of the barrel and plunger assembly 23, 3| will be received in the notch 28 and the lower end of' the stem I5 will engage the armi yand force it downwardly thus forcing the jaw 38 downwardly and inwardly and out of engagernent with the Vpipe V36, as shown in Figure 6,

' so that the' tool may then be withdrawn from` the well andreloaded and reset for another operation.

The drawings and` description are illustrative merelywhile the broad principle of the invention willfbe dened' by the `irn-Dended claims.

What l. claim. is:

l. Apipe'perforator comprising, a body shaped to be lowered .into a pipe in a well and having a radi-al bore opening outwardly thereof, a tubular barrel slidable i-n thebore of the body, a plug mounted in the barrel and having an inlet channel'therethrough,V a'slidable plunger in the barrel behind the plug, means retaining the plunger and plug initially in inner position, means for forcing the `barrel: and plug assembly radially outwardly, as a unit to contact the barrel' with the well pipe, and means for forcing the plugfurtherrradially outwardly, independent of the barrel, to cause the plug to penetrate the wall' of the pipe.

2. A pipe perforatorcomprising, abody adapted to be inserted into a pipe in a well and having a radial bore opening outwardly thereof, releasable means fork anchoring the body in the pipe, an.assemblyslidable in ythe bore including a tubular barrel, a ,plug in the barrel and a plunger in the barrel inwardly of the plug, means adapted toretain the plug and? plunger initially in their inner position in the barrel, hydraulically operable wedge means associated with the body and adapted to force the assembly outwardly as a unit to contact the barrel with the well pipe,

upon initial actuation thereof, and upon further actuation thereof to force the-plug outwardly of the body and intoy and Vthrough the pipe, said hydraulicaliy operable means being adapted, upon nalmovement thereof, to positively release the anchoring means to permit vthe withdrawalfy cf thetool from the well.

3. A pipe perfor-atar comprising, a bodyadapted toA be inserted intoa pipe in a well and having a radial bore opening outwardly thereof, a pipe engaging.l jraw' mounted.' on the body, means for positively'retaining the jaw in retracted, or inner, position while Vthe. tool is being. lowered intoxthe pip-e,.meansengageable with the pipe, upon upward movement ofthe tool therein, and effective to release the jaw, means for moving the jaw outwardly into engagement with the pipe upon subsequent downward movement of the tool, a barrel slidable in. the bore ofthe body, a channeled plugy inthe barrel, ,a plunger .in the barrel behind the plug, .means retaining the plunger and plug, initially in inner position in thebarrel,

hydraulically operable means associated with the body and adapted to force said barrel outwardly against the pipe and to force the plug further outwardly into and through the pipe, said hydraulically operable means being adapted, upon iinal movement thereof, to release the jaw from the pipe to permit the withdrawal of the tool from the well.

4 A pipe perforator comprising, a body adapted to be inserted into a pipe in a Well and having a radial bore opening outwardly thereof, a pipe engaging jaw mountedY on the body, means for positively retaining the jaw in retracted, or inner, position while the tool is being lowered into the pipe, means engageable with the pipe, upon upward movement of the tool therein, and effective to release the jaw, means for moving the jaw outwardly into engagement with the pipe upon subsequent downward movement of the tool, a barrel slidable in the bore of the body, a channeled plug in the barrel, a plunger in the barrel behind the plug, means retaining the plunger and plug initially in their inner position in the barrel, operable means associated with the body and adapted to force said barrel outwardly against the pipe and to thereafter force the plug outwardly of the body and into and through the pipe, said operable means being adapted, upon final movement thereof, to release the jaw from the pipe to permit the withdrawal of the tool from the well.

JOHN R. JOBE.

REFERENCES CITED The following references are of record in the le of this patent:

UNrrED STATES PATENTS Number Name y Date 2,125,487 Church Aug. 2, 1938 2,210,125 Raymond Aug. 6, 1940 2,212,044 Ridley Aug. 20, 1940 2,328,782 BynumY Sept. 7, 1943 2,355,513 Cox Aug. 8, 1944 2,426,106 Kinley Aug. 19, 1947 

